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LT3991-3.3 Datasheet(PDF) 6 Page - Linear Technology

Part # LT3991-3.3
Description  55V, 1.2A Step-Down Regulator with 2.8A Quiescent Current
Download  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3991-3.3 Datasheet(HTML) 6 Page - Linear Technology

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LT3991/LT3991-3.3/LT3991-5
6
3991fa
Typical perForMance characTerisTics
EN Threshold
Boost Diode Forward Voltage
Power Good Threshold
Minimum Input Voltage
TA = 25°C, unless otherwise noted.
Transient Load Response,
Load Current Stepped from 25mA
(Burst Mode Operation) to 525mA
Minimum Input Voltage
LOAD CURRENT (mA)
0
5.0
4.8
4.0
3.4
3.6
4.2
4.4
4.6
3.8
3.2
3.0
800
400
3991 G19
1200
600
200
1000
TO START
TO RUN
VOUT = 3.3V
LOAD CURRENT (mA)
0
6.4
6.2
5.4
5.6
6.0
5.8
5.2
5.0
800
400
3991 G20
1200
600
200
1000
TO START
TO RUN
VOUT = 5V
TEMPERATURE (°C)
3971 G21
1.05
0.97
0.96
1.03
1.02
1.01
1.00
0.99
0.98
1.04
0.95
–55
155
35
65
125
95
5
–25
RISING THRESHOLD
FALLING THRESHOLD
BOOST DIODE CURRENT (mA)
3991 G22
1.6
0.4
0.2
1.2
1.0
0.8
0.6
1.4
0
0
1500
500
750
1250
1000
250
TEMPERATURE (°C)
3991 G23
95
88
87
86
93
92
91
90
89
94
85
–55
155
35
65
125
95
5
–25
10µs/DIV
3991 G24
VOUT
100mV/DIV
IL
500mA/DIV
VIN = 48V, VOUT = 3.3V
COUT = 47µF
Minimum Switch On-Time/
Switch Off-Time
Soft-Start
LT3991-X Frequency Foldback
TEMPERATURE (°C)
–55
400
350
150
50
200
250
300
100
0
65
5
3991 G17
155
35
–25
95
125
tOFF(MIN) 1A LOAD
tOFF(MIN) 0.5A LOAD
tON(MIN)
SS PIN VOLTAGE (V)
0
2.5
2.0
0.5
1.0
1.5
0
1.25
0.75
3991 G18
2
1
0.5
0.25
1.75
1.5
VOUT (% OF REGULATION VOLTAGE)
0
0
100
300
400
500
40
80
100
900
3991 G30
200
20
60
600
700
800


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